Accessory for radio signal receivers



July 24, 1928.

5. N. FLEMING Accassony mn RA'DIO SIGNAL RECEIVERS Filed Sept. 2, 1927 mu. I m I I N V EN TOR. 50am e/1Vf7emiij9,

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SAIEF'EUEL ELEMENG, 0F I-KUPKIHQVXLLI E, KEENEU Application files September 2, 192?.

. arrangement and combination of parts, as

will he understood more fully from thefollowing description and accompanying draw inns, wherein Figure 1 is a formal diagram showing a simple receiver With my appliance connected therein at 10,

Figure 2 is a. detail oli auxiliary unit,

Figure 3 is a detail longitudinal sectional View of the special receptacle and contents.

There is illustrated in Figure 1 a formal showing of a receiver 9, the parts of which are represented diagrammatically the details of which need not be described, except to state that there is shown at 11 a conventional representation of a radio freqnency transformer to one end of the primary of which an antenna 12 is connected. with my improved accessory l0 interposed or connected in series to the leads from the antenna and one end of the primary of the ti ztnst'ormer ll. The opposite end of the primary may be grounded or otherwise eonnected in accordance with approved praciices,

.i'here is a sealed receptacle 1! The device 10 coniiprises an ornamental case 12, l'iaving hinding posts 13 and. 14 to which the lGtHlS l I'OHI the antenna and to the set may be connected. Within the box which. is

' customarily formed of non-condnctive niaterial. The receptacle may he closed by a screw cap 16 whereby a. filling is held securely contained Within the receptacle. [it o )ositc ends o'l the receptacle there are masses 17 of Whatis known as steel WOOl, the two masses heingr spaced apart and out of mutual contact. Conductor plates 18am interposed between the steel Wool and the Eerie Ho. snares.

pletely filling the interstices of the steel 60 Wool. The WOOl is rammed in the receptacle and a certain amount of resilience in the mass of fibers causes it to press outwardly against the plates 18, as will he readily understood.

Also enclosed in the case 10 there is a variable condenser 21, one set oi? plates in" which have flexible connections the Wire 20, While the other set of plates oat the condenser are connected to the binding post 14. The condenser ,1 may he oi .0095 MF capacity, although other cape-cities may he found desirable for particular types of sets, or for reeeivingwarticular wave lengths. The capacity indicated is found to operate satisfactorily on the wave band of public broadcasting stations, now operated.

The terminal 13 lacing connected to an antenna lead-in, and the loin-Cling post it being connected to the input terminal lit a receiver. in appliance has heen rtonncl operate Wit 1. great satisfaction in improving clarity of reception and to a. certain extent Inoclitying the eiiect of static. ,lit isnh'itp claimed by persons who have used it to improve tone in musical reception. 'rtt reas on forthe eit ect thus produced by the appliance is not tally understood, but may be due in part to dampening effect whic is developed by the lihers acting especially npon staccato impulses as are involved by static, Without being appreciably active in similarly aliecting the frequencies corre sponding to the range of musical sounds end voice vibration. I

In the use of the device, a certain degree of tuning may be done with the knob fi l connected to the movable plates of the condenser 21.

l claim 1w 1. In a device of the character described, antenna and the receiver, said masses being a container formed of insulating material separated fromeach other a distance. having a content of a mixture of an insulat- 2. The structure of claim 1 in which the 10 ing fluid and a mass of extremely finel mass of wool-like fibres is of magnetic metal.

5 divided conductive material, a, mass of woo In testimony whereof I afiix my signature.

like metal fibers embedded in the mixture at each side connected respectively to the SAMUEL N. FLEMING. 

